A sliding module includes a main housing; a sliding housing on the main housing, a push rod interposed between the main housing and the sliding housing to provide an elastic force to slide the sliding housing, a support member mounted on the main housing and rotatably or slidably coupled with the push rod, and a locking member disposed on the push rod and the support member. The locking member blocks the push rod to limit the sliding of the push rod on the support member and allows the push rod to slide when the push rod rotates on the support member according to the sliding of the sliding housing.